Polylux (overhead projector)

The overhead projector is an originally produced in the GDR overhead projector. Polylux in the GDR was a generic name for overhead projectors.

The overhead projector was manufactured in East Germany since 1969 by the state-owned enterprise VEB Phylatex physics Gerätewerk GDR in Frankenberg in Chemnitz (formerly Karl- Marx-Stadt ). He was widespread among other things, the educational institutions of the GDR. From 2004 Polylux was a registered trademark of Polytechnic Frankenberg GmbH, which built the machine as a successor company of the original Polylux producers and sales. Each year an average of 27,000 units were built until 1989, which were also exported to the Soviet Union. In 2004, there were 6,000 units built per year.

In 2006 the company was closed.

The word Polylux (from the Greek and Latin: " lots of light " ) invented Erich Schöpe, physicist and former head of development of Polylux manufacturer. Today it has on the one hand, as a typical East German word cult status and is on the other in the current parlance, still widely used in the new federal states.

An ORB (now RBB) produced broadcast ( see Polylux (television ) or Tita von Hardenberg), was named " enlightening " function of the device after the Polylux based on the.

The housing of the Polylux consisted of plastic and contained a fan with delayed switch-off ( bimetal ) to avoid heat accumulation. The light source was a halogen lamp for line voltage. It had a switch for two levels of brightness.

Originally, the devices of the Polylux lenses made ​​of glass. For weight reduction later, lenses made ​​of plastic used. The large-scale Fresnel lens, in particular serving as a backing sheet, is made of plastic.